White, D. “Form Factor Analysis Derived from the Gluon Emission Model Applied to the $\Psi(2S)$ and the $\Upsilon(2S)$”. Communications in Mathematics and Applications 1, no. 3 (December 25, 2010): 165–181. Accessed April 28, 2024. https://www.rgnpublications.com/journals/index.php/cma/article/view/124.